Various interceptors in the php class

1. When _ get ($ property) accesses an undefined property, it calls classlanjie {function _ get ($ name) {echo $ name. propertynotfound !;}} $ Obnewlanjie (); echo $ ob-g; when we call the $ ob undefined attribute g, call the interceptor _ get () method and output "gpropertynotfound !";

1. When _ get ($ property) accesses an undefined property, class lanjie {function _ get ($ name) {echo $ name. property not found is called! ;}}$ Ob = new lanjie (); echo $ ob-g; when we call the $ ob undefined attribute g, we call the interceptor _ get () method, output "g property not found! ";

1. It is called when _ get ($ property) accesses an undefined property.

class lanjie{    function __get($name)    {        echo $name." property not found! ";    }}$ob = new lanjie();echo $ob->g;

When we call the $ ob undefined attribute g of the object, call the interceptor _ get () method and output "g property not found !";

2. _ set ($ property, $ value) assigns a value to an undefined property call.

class person{    private $_age;    private $_name;    function __set($name, $value)    {        $method = "set".  ucfirst($name);        echo $method;        if(method_exists($this, $method) )        {            return $this->$method( $value );        }    }        function setName( $name )    {        $this->_name = $name;        if( !is_null($this->_name) )        {            $this->_name = strtoupper($this->_name);        }    }    function setAge( $age )    {        return $this->_age = (int)$age;    }}$p = new person();$p->name = 'bob';print_r( array( $p ) );

We can clearly see that when an undefined 'name' value is assigned, "_ set ()" is called ()"

Others include _ call (), _ isset (), and _ unset ();

The most useful and commonly used here is _ call (), which is called when an existing method is called; _ isset () is called when an isset () function is used for a defined attribute, and _ unset is called when unset is used for unset numbers.

Http://blog.csdn.net/shuiping567541/article/details/7061258